Cannot load /usr/local/psa/admin/libexec/mod_info.so into server: /usr/local/psa/admi

[LastOttoman]

I just upgrade Plesk 7.1 to Plesk 7.5.

when I want to start psa service i'm getting error below:

Syntax error on line 213 of /usr/local/psa/admin/conf/httpsd.conf:
Cannot load /usr/local/psa/admin/libexec/mod_info.so into server: /usr/local/psa/admin/libexec/mod_info.so: undefined symbol: top_module
/usr/local/psa/admin/bin/httpsdctl start: httpd could not be started

what is the problem ?